Coal and Lignite Definition

Definition of Coal and Lignite

The general Coal and Lignite definition can be stated as: Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds. On the other hand, Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat. Along with definition of Coal and Lignite, get to know about Properties of Coal and Lignite. Get to know more information about Coal and Lignite origin and discoverer, etymology and class.

History of Coal and Lignite

The history of Coal and Lignite gives information about where the rock was found and who was its discoverer. Almost each and every aspect of Earth's history is recorded in rocks be it the volcanoes which were erupted or the plants, animals and organisms which are now extinct, as rocks are present from millions of years.

Coal and Lignite Origin and Discoverer

Coal and Lignite definition gives us a brief idea about the two rocks. In some cases, the definition also gives summary about the Formation of Coal and Lignite. In this section, you will know about Coal and Lignite Origin and Discoverer. Origin of Coal is USA whereas Origin of Lignite is France. It is interesting to know the name of Coal and Lignite discoverer. The Discoverer of Coal is John Peter Salley and the discoverer of Lignite is Unknown.

Etymology of Coal and Lignite

Along with Coal and Lignite definition, know more about the etymology of Coal and Lignite. Etymology of Coal and Lignite gives information about origin and formation of a particular rock. Know more about Formation of Coal and Formation of Lignite. The etymology of Coal is From the Old English term col, which has meant mineral of fossilized carbon since the 13th century while that of Lignite is From the Old English term col, which has meant mineral of fossilized carbon since the 13th century. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Coal and Lignite belong to Sedimentary Rocks. The sub-class, group and other categories of Coal and Lignite are listed below.

For Coal,

• Sub-class: Durable Rock and Soft Rock
• Group:
• Other Categories: Coarse grained rock, Fine grained rock, Medium grained rock and Opaque rock

For Lignite,

• Sub-class: Durable Rock and Soft Rock
• Group:
• Other Categories: Coarse grained rock, Fine grained rock, Medium grained rock and Opaque rock